My daughter and sister in law are both epileptic, I understand your frustration. My daughter had two seizures about a fortnight ago, after no seizures since last March, really thought we had cracked it this time. My sister in law was uncontrolled for years, but has had her driving licence back since last May - so there can be light at the end of the tunnel.
Have you looked into the forums on Epilepsy Action? I have found their support to be really useful and there are plenty of people on there in the same position as you who really know first hand what you are dealing with.
Also see if you can find a local epilepsy support group, we belong to one in Swindon and their support has been invaluable to us.
It sounds like you have very supportive parents, and that is also very important, although (and I may be talking out of turn here!) they probably fuss too much. My daughter gets very frustrated with me because every time I hear a bang from her bedroom I'm halfway up the stairs to make sure she's ok!
My sister in law says that when she comes round from a seizure the first thing she thinks is shit it's happened again, and feels so low and depressed. She has had some awful seizures, fallen down stairs so many times and has a badly scarred tongue as well.
As for having more children or moving out of home, just take one step at a time. My sis in law has resigned herself to only having one child, and just concentrates on making sure that she keeps herself as well as she can for him. I know the last thing she wanted was an only child, as she is an only child herself, but her health is far more important.
I hope this has helped - I do tend to go on a bit too much!